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Published online 27 October 2006
Published in J Environ Qual 35:2352-2359 (2006)
DOI: 10.2134/jeq2005.0478
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of Wetland Methyl Mercury Export as a Function of Experimental Manipulations

Mae Sexauer Gustina,*, Prithviraj V. Chavanb, Keith E. Dennettb, Eric A. Marchandb and Susan Donaldsonc

a Dep. of Natural Resources and Environmental Sciences, Univ. of Nevada, Reno, NV 89557
b Dep. of Civil and Environmental Engineering, Univ. of Nevada, Reno, NV 89557
c Nevada Cooperative Extension, Reno, NV 89520


Figure 1
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  		Fig. 1. Schematic showing the experimental designs for constructed wetland mesocosms used for this study. Paired mesocosms used for the manipulations are indicated by common labeling. In most cases one of the paired mesocosms was used as a control and the other manipulated.

 

Figure 2
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  		Fig. 2. The {Delta}C MeHg (outlet-inlet concentrations) in water before and after drying and subsequent rewetting. Control mesocosm (CM) indicates data in which flow was maintained over the course of the manipulation and manipulated mesocosm (MM) data for which flow was stopped and the wetlands allowed to dry. The {Delta}C TSS (outlet-inlet) indicates total suspended solids concentration.

 

Figure 3
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  		Fig. 3. The {Delta}C MeHg (outlet-inlet) concentration in water before and after drying over the winter and during resumed flow after subsequent rewetting in the spring. The left panel is data from the mesocosms with contaminated water and the right panel from those with clean water. Open bars represent mesocosms with contaminated sediments and those with dark bars represent clean sediments.

 

Figure 4
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  		Fig. 4. The {Delta}C MeHg concentrations in water before, during, and after the sulfate addition. Sulfate was added to mesocosms with clean water influent and Hg-contaminated sediments (left panel) and clean sediments (right panel). CM indicates the control mesocosm, whereas MM indicates data from the manipulated mesocosm.

 

Figure 5
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  		Fig. 5. The {Delta}C MeHg in water between the mesocosm outlet and inlet prior, during, and after (Day 63) nitrate addition for designs with clean water and Hg-contaminated sediments (left side) and clean sediments (right side).

 

Figure 6
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  		Fig. 6. The {Delta}C sulfate concentration (inlet minus outlet) and {Delta}C dissolved methyl mercury (MeHgD) (outlet minus inlet) concentration for all data collected during this study.

 




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